Trisazo dyestuffs of the stilbene series



United States Patent TRISAZO ,DYESTUFFS on THE .STILBENE SERIES August Schweizer, Muttenz' llasel Land, near Basel, Switzerland, assignonby mesne assignments, to Saul-'& (30., Newark, .N. J., as nominee of Fidelity Union Trust Company No Drawing. Application August 23, 1954, Serial No.451,685

Claims priority, application Switzerland August 27, 1953 6 Claims. (Cl. 260-145) The present invention :relates to trisazo dyestuffs of the stilbene series.

According .to this invention, valuable trisazowdyestufis of the stilbene :series are obtained when onemolof the diazo compound of an aminomonoazo dyestufi of the formula S QaH H as ,(I)

wherein x stands .for a .nitro, NH-.acyl or.naphthylenetriazole group, and ystands for atgroup which enables metal complex formation to take place, anil wherein nucleus A may carry additional substituents such as are conventional in azo dyestufis (e. g. alkyl groups, 'alkoxy groups, 'a'cylamino groups), the --N=N-- group "being in one of the positions "4 or 5 of the said nucleus, "is coupled with one mol of a mono'azo dyestutf oftheforrnula HOsS- Z or with a metal complextcornpound thereof, the coupling taking placeoin the indicated'fiaposition, one z-in F01? mula II-being OH and ,the other 2 standing @for N=N--R, wherein -R is a radical ,of the benzene .or

naphthalene series .which contains .a metal complex form- .ing group in ortho-positionto the -N=N- group, and

pionic acid, butyric .acid and 'isobutyric acid, or from dicarboxylic acids, eaghthe .CO.COOH,

and --CO-CH=CH--'C.OOH groups. Other valuable acyls 'are the acyl groups derived from aromatic monocarboxylic :acids, such for example as 'benzoic acid, 3-nitrobenzene-lmarboxylic acid or 4-nitrobenzene-11- carboxylic acid, or the acyl groups derived from benzenel;2-, 1,3- and 1,4-dicarboxy'lic acids wherein the carboxyl groups .are free lorgesterified, .or the acyl groups derived from *1ecarboxybenzene-4-sulfonic acid and 1=carboxybenzeneZA-disulfonic acid, "the connection to NH being through ithe carhoxyl group. The term NH-acyl? can, however, also represent'the radical of a carbaniinic acid, e. g. the NH-C'OOLCH3,

Groups y which are capable of metal complex formation are --'COOH,--0CH3 or --OC2H5. I

"Illustrative of the additional substituents which may be carried by nucleus A are-methyl, 'methoxy, ethoxy, acetylamino, etc. v

'The radical R "of the benzene or naphthalene series whichyaccordingto Formula I'L'is connected tothe 1,5- or '2,5-dihydroxynaphthalene 7-sulfonic acid residue by means ot an 'azo group, carries an ortho=position to the said am group "a group which is capable of metal complex formation. "Such groups "are, for example, ()H, ---COOH, "OC'H3 and OC2'H5. The radical R may also containadditional"substituents, such'for example as halogen atoms (e. g. chlorine), 'alkyl ,groups (e. g. methyl-Lalkoxygroups "(e.'g.'methoxy, 'ethoxy), free or esterified carboxylic acid groups (e. g. -COO.CH3, COO.C2H5), sulfonic acid groups, alkylsulfonyl groups (e. g. SOz-CH3), sulfonic acid amide groups and delrivatives thereof substituted at the nitrogen atom by alkyl, cycloalkyl, aralkyl, aryl or acyl (e. g. -SOz.NI-I.CH3, -.SOz.-NH.CzH4.OCHa), nitro groups, amino groups, and -amino;groups which are substituted by alkyl, cycloalkyl,

aralkyl, aryl or acyl (e, g. -NH.CH3, ---NH.CsH5).

HOIS

HOs 1/ (In) The trisazo dyestuffs according to the present invention correspond in the metal-free state to the formula wherein at, wy .:and z have "the precedingly-recited"significances, wherein the --N=N- group designated by (a) is in the -4- or.5-position of nucleus A, and wherein w standsifor ,H, lower alleyl, lower alkoxy or acylarnino. .The'aminoazo -dyestuifsof Formula 1, used as diazo components, may be prepared for vexample by coupling diazotized 4-nitro-, 4-,acylaminoor 4-naphthylenetriazole-4-an1in0stilbene 2,2'-disulfonic acid with .primary amines of the benzene series which couple in vparaposition to the amino group and which contain, in orthoposition to "the "amino group, a group which is capable of metal complex formation. It is frequently advantageous to employ these amines in the form of their w-mcthanesulfonic acid derivatives; the w-methanesulfonic acid group is split off again by saponification, following the coupling. Those aminomonoazo dyestufis, wherein x stands for nitro or for the naphthylenetriazole group, may in part also be prepared .by condensing 4,4'-dinitroor 4-naphthylenetriazole 4-nitrostilbene-2,2'- disulfonic acid with 1,3- or 1,4-diamino compounds of the benzene series in aqueous-caustic alkaline medium.

Aminomonoazo dyestuffs of Formula I, wherein the azo group is in 5-position of the nucleus A and wherein y stands for an alkoxy group, are prepared for example by coupling diazotized 4-nitroor 4-naphthylenetriazole- 4-aminostilbene-2,2'-disulfonic acid with Z-acetylaminol-hydroxybenzene, and alkylating the hydroxy group and splitting otI the acetyl group.

The monoazo dyestuffs of Formula II, used for coupling, are described, on the one hand, in German Patents Nos. 571,859 and 807,289 and, on the other hand, in Swiss Patents Nos. 278,942 and 281,986.

The diazotization of the aminomonoazo dyestutts of Formula I is advantageously carried out in indirect man ner. The diazo compound attaches to the azo component in the 6-position of the monoazo dyestuff of Formula II. This coupling is advantageously carried out in alkaline solution, optionally in the presence of organic bases, such for example as pyridine, pyridine base mixture, or quinoline. In this connection, the azo components may be present in metal-free form or as metal complex compounds.

A series of trisazodyestutfs of Formula III, wherein x represents a naphthylenetriazole radical, can be prepared from trisazo dyestutfs of Formula III wherein x stands for N02 or NH-acyl and which contain no further amino, nitro or acylamino groups than those mentioned, by reducing the nitro group to the amino group or saponifying the NH-acyl group to the amino group, diazotizing the thus-obtained aminotrisazo compounds, coupling with a 1 or Z-aminonaphthalene which couples in ortho-position to the amino group and which may contain additional HOIS substituents, particularly water-solubilizing groups, and oxidizing the ortho-amino-azo grouping in the resultant tetrakisazo compound to the triazole group before or simultaneously with the metallization in substance.

The metal-free or only partly metallized trisazo dyestufis dye cotton and fibers of regenerated cellulose in reddish blue, gray, brown to olive-green shades. The dyeings, metallized on the fiber, e. g. coppered, are fast to light and to washing.

The obtained trisazo dyestuffs can also, according to this invention, be converted in substance into their complex compounds containing one or two atoms of metal. Suitable for this purpose as metal-yielding agents are for example copper and nickel compounds. The coppering, for example, can be carried out according to any of the various methods known from the literature, as for instance by heating the deystuffs with copper salts in weakly acid to alkaline medium, if desired under pressure and/or in the presence of ammonia and/or organic bases,

or in a fusion of alkali salts of low molecular aliphatic monocarboxylic acids. Where one of the groups which enables the formation of a metal complex is an alkoxy group, the metallization takes place with splitting of this group.

The metal-containing trisazo dyestuffs possess an excellent afiinity for cotton and fibers of regenerated cellulose. They dye these fibers in light-fast and wash-fast reddish blue, gray, brown to olive-green shades. By treatment of the dyeings with aftertreating agents such as are conventional in textile dyeing, the wash-fastness thereof can be enhanced.

The following examples illustrate the invention, but are intended to limit the same. In these examples, the parts and percentages are by weight; the temperatures are in degrees Centigrade.

EXAMPLE 1 29.6 parts of 4-nitro-4-(2"-methyl-4"-amino-5"-meth oxy)-phenylazo-stilbene-2,2-disulfonic acid are dissolved, in the form of the sodium salt, in 1000 parts of warm water. The solution is cooled to 15 and the amino monoazo dyestuff is then diazotized by the addition of an aqueous solution of 3.5 parts of sodium nitrite and 33 parts of 30% hydrochloric acid. The suspension of the diazo compound is run into a solution of 22.5 parts of the copper complex compound of 1-(2-carboxy)- phenylazo-2,S-dihydroxynaphthalene-7-sulfonic acid, 60 parts of pyridine, 25 parts of 25% aqueous ammonia and 800 parts of water. Upon completion of the ensuing coupling, the obtained trisazo dyestuff is isolated and is subjected in conventional manner to demethylating coppering with ammoniacal copper oxide at 90 in aqueous solution in the presence of diethanolamine. The isolated and dried copper complex compound of the dyestulf corresponds to the formula and is a dark powder which dissolves with gray-blue coloration in water and with greenish blue coloration in concentrated sulfuric acid, and dyes cotton and fibers of regenerated cellulose in fast greenish blue shades.

EXAMPLE 2 29.6 parts of the aminomonoazo dyestuff employed in Example 1 are diazotized after the manner set forth in such example. The suspension of the obtained diazo compound is run into a solution of 24.7 parts of the copper complex compound of 1-(2-carboxy-4-nitro)- phenylazo-2,5-dihydroxynaphthalene-7-sulfonic acid, parts of pyridine base mixture, 25 parts of 25 aqueous ammonia and 600 parts of water. Upon completion of the ensuing coupling, the obtained tn'sazo dyestutr' is isolated and is subjected in conventional manner to de methylating coppering with ammoniacal copper oxide at in aqueous solution in the presence of pyridine base mixture. The copper complex compound is precipitated from the coppering solution by the addition of sodium chloride .and is .then vfiltered ofi and dried. -It corrcparts ofisodium carbonate in 100.0partsof water. Upon spondsto the formula completion of the ensuing coupling, the trisazo dyestuflf is isolated and is subjected to demethylatingcoppering in conventional manner. Theobtained copper complex compound correspondstotheformula and is a dark powder which =dissolves with blue-gray coloration in Water and with igreenish 'b'lue coloration HOail in concentrated sulfuric acid. The dyestufi dyes cotton and, in the dried state, is a dark powder which dissolves in light-fast gray shades. p. with olive-green coloration in Water and with brown-vio- EXAMPLE 3 let coloration in concentrated sulfuric acid, and dyes cotton in fast olive-green shades. 29.6 parts of the .aminomonoazodyestufiiused in Exv v ample 1 are diazotized as in that example. "The suspen- V EXAMPLE 5 V sion o'fthediazo compound i'srun into lutionof 255-1 r parts of the copper complex compound d (2'-hydr'oxy)- 28 Parts Of Y y phenylazo 2,5 dihyflro 'gynaphthalg'flg disulfonic methoxy) phenylazo StllbCIlfi --Z,2' CllSllifOlliC acid QI'C id parts f i'di e d 35 rt 'f,;2 5% aqueous diazotized after the manner described in Example 1. The ammonia in 600 partsof' 'water. Upon conclusion of the obtained suspension of diazo compound is run into a soluensuing coupling, the obtained trisazo dyestutfsisisolated tion of 27.6,parts of the azo component used in Example and is subjected to demethylating copperin'g in conven- 40 4, 30 parts of sodium carbonate and 1000 parts of water. tional manner. In theidried state, zthe' ccoppered dyestutf Upon completion of the ensuing coupling, the obtained corresponds to the formula trisazo dyestufi is isolated and subjectedin conventional HOsS HOzS

and is a dark powder which dissolves ,with greenish blue mannerwto demethylating coppering. The dried coppercoloration in water and with blue-gray -.coloration in concontaining dyestuif corresponds tothe formula Hols CH -N=N H1 SO3H OHONH'COGH| HOJS centrated sulfuric acid, and-dyes cotton :in fastsgreenish I blue'shades' EXAMPLE 4 and is a dark gpowder'which dissolves with olive-green coloration in water randwith violet coloration in concen- 29.6 parts of the aminomonoazotlyes'tutf used in Extrated sulfuric acid, and dyes cotton in'fast grayish olive ample liarefliazotized according :to the prescriptions- 0f shades. I, p

the said example. The-suspension of thediazo compound Additional examples ofdyestuifs ace rding to the pres is run into a solution of 27.6 parts of I the "copper eoment invention, which can be preparedzafter the manner deplex compound "of 1f5 dihydroxy l-(-2 hydroxy)-=naphscribed in Examples 1-5,. are set JfOIlQhll'l the following 'thyl(1) -"azon'aphtha1ene---4',7 disixlfoiiicacid-a'ndSO table. These dyestuffs are characterized :by their cliazo 9 I contains 1 atom of nickel is precipitated by the addition of sodium chloride and is then filtered off. It .is,dissolved centrated sulfuric acid. The "dyestulf dyes cotton and in 1000 parts of "hot water, z'indl'00parts o'f diethanolfibers of regeneration cellulose inIlig'ht-fastgray shades. amine, 25.parts of aqueous ammonia and an aqueous solution of 15 parts of crystallized nickel sulfate are 5 7 EXAMPLE 33 added. The mixture is then heated for some hours at 95. The obtained trisazo dyestuff which contains 2 atoms of nickel in complexbindingisprecipitated by the addition of sodium chloride and is then filtered off and dried. It corresponds to the formula. 10

The trisazo dyestufi which is obtained after the manner set forth in Example .2, and which contains 1 atom of copper is treated with nickel sulfate after th-e frnanner set and is a dark powder which dissolves with blue-gray colforth in Example .31. The thusobtained nickel-copper oration in water and with greenish blue coloration in concomplex compound corresponds to the formula I N0: HOuS centrated sulfuric acid. The dyestuff dyes cotton and 0 fibers of regenerated cellulose in light-fast gray shades. and is, in the dry state, a dark powder which dissolves EXAMPLE 32 40 with blue-gray coloration in water and with greenishblue coloration in concentrated sulfuric acid. The dye- The tnsazo dyestuff which is obtained after the manner stufi dyes gotten in lighbfast gray hadsi set forth in Example 31, containing 1 atom'of-nickel is dissolved in 1000 parts of hot water, 50 parts of 'die'thanolamine and 31 parts of 25% aqueous ammonia. After EXAMPLE 34 addltlon of an aqueous solutlon of 12.5 parts of crystal If the trisazoflyagtufiwhich is Obtained after themam l'd lftthmixtr'sheatdf el kic n lrs 212 58 he c abtai ned co l l er nickel corn p ler t c o n iner set X mp and Whlch 60111131115 1 atom of pound i precipitated by h ddi i of di hl i copperiis treated with nickelsulfate, diethanolamine and :and is then filtered off and dried. It corresponds to the .am fii ft theimanner set foflhgin Example 31, there formula is obtained a nickel-copper complex compound which corresponds to the formula and is 'a dark powder which dissolves with blue-gray col- In the dry state the dyestulf is a dark powder which oration in water andwith bluish green colorationin'c'ondissolves "with grayish-blue coloration in Water and with greenish-blue coloration in concentrated sulfuric acid. It dyes cotton in light-fasct gray shades.

The dyestuffs of Examples 8, 15, 16, 17 and 18 may be used for dyeing in the form of their complex compounds containing only one atom of copper and can then f be aftercoppered on the fiber according to per se conventional methods. It is also possible to replace in the above cited examples the copper complex compounds used as azo components by the respective nickel complex coin- HOaS HOaS

pounds or by the metal-free compounds. With the thus prepared dyestuffs there are obtained the same shades,

12 EXAMPLE 3s H015 OH HOOC The trisazo dyestutf which contains one atom of copper and which corresponds to the formula when aftercoppered on the fiber, as with the metal com- 30 obtained from the diazo component of the preceding plex compounds which contain two atoms of copper or nickel or one atom of copper and one atom of nickel.

Representative examples are 11, 19, 22 and 23. The formulae of the thus-obtained dyestuffs are:

paragraph and the copper complex compound of the azo component of the preceding paragraph, also yields valuable gray shades on cotton and fibers of regenerated cellulose by the aftercoppering process.

EXAMPLE 11 Hols o ou c l mo Hoiso-ou-ooo n- NH-CO"-'CHI N No,

EXAMPLE 10 Hols 911*0 l moo Hots o-cu-ooc E-O-NB-CO-OH:

I N N- N0: H 0 r 8 EXAMPLE 22 1101 s oou-o l 0HC N=N N=ti HOIS- N=N HOsS SOaH

'13 EXAMPLE 36 A dyebath consisting of 3000 parts of softened water and a solution of 0.5 part of the dyestuff according to Example 2 in parts of hot water is charged, at with 100 parts of wetted cotton. After the addition of 5 parts of sodium sulfate, the dyebath is heated to 100 in the course of 30 minutes, 5 additional parts of sodium sulfate being added at and also at 70. is continued for 15 more minutes at 100, after which five more parts of sodium sulfate are added and the bath allowed to cool. At 50, the cotton is withdrawn, thoroughly rinsed with cold water and dried at- The: cotton is dyed a neutral gray shade of verygoodfastness The fastness to washing df "tliis dyeih'g can be improved by aftertreatment with a' coppeficonta-ining -polyalkylenepolyamine. For this *pur ose, --'an'= af-tert-reating bath is prepared from 3000 parts of water and 1 part HOaS of a copper-containing polyalkylenepolyamine. The dyed and rinsed cotton is introduced into the bath and is treated therein for 30 minutes at HOIB | Boss then withdrawn, rinsed with cold water and dried at 60. The dyeing, which is now somewhat more greenish in HOaS Q shade, is of very good fastness to light and excellent fastness to washing.

Hots

cs LG Having thus disclosed the invention, what is claimed is: 1. A trisazo dyestuif which corresponds to the formula H OaS- a: CH=CH 01H SOI The dyeing wherein x "stands"for a member scfletedfrom rh group consisting of a nitro, carboxyacylatriino and naphthylene triazole group, y stands for a member selected from the group consisting er a carboxyl, methoxy and ethoxy group, one z stands for hydr oxy, and the otherz stands for an az'oR residue, R'beingainonm to bi-ntfclear carbocyclic aryl radical which contains in th e orthoposition'resp ctive to azo a member. selected from-the group consisting of a hydroxy, carboxy,-methoxy and 'ethbxy grcsnp, w stands for a member selected from the group consisting of hydrogen, lower alkyl, lower alkoxy I and carboxyacylamino, each of Me and Me" stands for a metal selected from the group consisting of copper and nikLn stands for one of the numerals 1, 2 and 3, and

The cotton is 30 n-QNn-o o-om v o-c ---o H843 HOIS- N=1F NN v wherein the -N='N-- group indexed (a) is in one of the p'os'i ti'o'ns 4 and Sof the nucleus A.

2. lihe copper coiitaining trisazo dyestutf which corresponds to the formula O-Cu-O O O 3. The copper-containing tnisazo dyestulf which corresponds to the formula 4. The copper-containing trisazo dyestulf which corresponds to the formula 5. The copper-containing tnisazo dyestuff which corresponds to the formula OaH (Me") n-i 6. The copper-containing trisazo dyestufi which corresponds to the formula 2 References Cited in the file of this patent UNITED STATES PATENTS 

1. A TRISAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA 